Air For Combustion And Ventilation; Direct Vent (2-Pipe) Applications; Ventilated Combustion Air Applications; Outdoor Combustion Air Method - Carrier 59TN6A Installation, Start-Up, Operating And Service And Maintenance Instructions

AIR FOR COMBUSTION AND
VENTILATION
Introduction
Direct Vent (2-pipe) Applications
When the furnace is installed as a direct vent (2-pipe) furnace, no
special provisions for air for combustion are required. However,
other gas appliances installed in the space with the furnace may
require outside air for combustion. Follow the guidelines below to
insure that other gas appliances have sufficient air for combustion.
Non-Direct Vent (1-pipe) Applications
When the furnace is installed as a non-direct vent (l-pipe) furnace,
it will be necessary to insure there is adequate air for combustion.
Other gas appliances installed with the furnace may also require air
for combustion and ventilation in addition to the amount of
combustion air and ventilation air required for the furnace. Follow
the guidelines below to insure that the furnace and other gas
appliances have sufficient air for combustion.
Ventilated Combustion Air Applications
When the furnace is installed using the ventilated combustion air
option, the attic or crawlspace nmst freely communicate with the
outdoor to provide sufficient air for combustion. The combustion
air pipe cannot be terminated in attics or crawlspaces that use
ventilation fans designed to operate during the heating season. If
ventilation fans are present in these areas, the combustion air pipe
nmst terminate outdoors as a Direct Vent/2-Pipe system.
All air for combustion is piped directly to the furnace from a space
that is well ventilated with outdoor air (such as an attic or crawl
space) and the space is well isolated from the living space or
garage. In addition, other gas appliances installed in the space with
the furnace may require outside air for combustion. Follow the
guidelines below to insure that the roof or crawlspace walls have
sufficient free area to provide sufficient air for combustion and
ventilation for the furnaces. The guidelines below can be used to
insure that other gas appliances have sufficient air for combustion.
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
• U.S.A. Installations: Section 9.3 of the NFPA 54/ANSI
Z223.1-2009, Air for Combustion and Ventilation and
applicable provisions of the local building codes.
• Canada: Part 8 of the CAN/CSA-B149.1-2010, Venting
Systems and Air Supply for Appliances.
FURNACE CORROSION HAZARD
Failure to follow this caution may result in furnace damage.
Air for combustion nmst not be contaminated by halogen
compounds, which include fluoride, chloride, bromide, and
iodide. These elements can corrode heat exchangers and
shorten furnace life. Air contaminants are found in aerosol
sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
iniury or death.
The operation of exhaust fans, kitchen ventilation fans,
clothes dryers, attic exhaust fans or fireplaces could create a
NEGATIVE PRESSURE CONDITION at the furnace.
Make-up air MUST be provided for the ventilation devices,
in addition to that required by the furnace. Refer to the
Carbon Monoxide Poisoning Hazard warning in the venting
section of these instructions to determine if an adequate
amount of make-up air is availaMe.
The requirements for combustion and ventilation air depend upon
whether or not the furnace is located in a space having a volume of
at least 50 cubic feet per 1,000 Btuh input rating for all gas
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appliances installed in the space.
• Spaces having less than 50 cubic feet per 1,000 Btuh (4.8 cubic
meters per kW) require the Outdoor Combustion Air Method,
• Spaces having at least 50 cubic feet per 1,000 Btuh (4.8 cubic
meters per kW) may use the Indoor Combustion Air,
Standard or Known Air Infiltration Method.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion,
ventilation, and dilution of flue gases using permanent hori-
zontal or vertical duct(s) or opening(s) directly communicat-
ing with the outdoors or spaces that freely communicate
with the outdoors.
2. Fig. 6 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and vent-
ilation air opening, to the outdoors.
a. One opening MUST commence within 12 in. (300 ram)
of the ceiling and the second opening MUST commence
within 12 in. (300 ram) of the floor.
b. Size openings and ducts per Fig. 6 and TaMe 3.
c. TWO HORIZONTAL DUCTS require I sq. in. (645 sq.
ram) of free area per 2,000 Btuh (1,100 mm2/kW) of com-
bined input for all gas appliances in the space per Fig. 6 and
Table 3.
d. TWO OPENINGS OR VERTICAL DUCTS require 1
sq. in. (645 sq. ram) of free area per 4,000 Btuh (550
mm2/kW) for combined input of all gas appliances in the
space per Fig. 6 and Table 3.
3. ONE OUTDOOR OPENING requires:
a. 1 sq. in. (645 sq. ram) of free area per 3,000 Btuh (734
mm2/kW) for combined input of all gas appliances in the
space per Fig. 6 and Table 3.
b. Not less than the sum of the areas of all vent connectors in
the space.
The opening shall commence within 12 in. (300 ram) of the
ceiling. Appliances in the space shall have clearances of at least 1
in. (25 ram) from the sides and back and 6 in. (150 ram) from the
front. The opening shall directly communicate with the outdoors or
shall conmmnicate through a vertical or horizontal duct to the
outdoors or spaces (crawl or attic) that freely communicate with the
outdoors.